The equation $x^2+x+1=0x^2+x+1=0$ has

If $\frac{x}{a-b}=\frac{a}{x-b}\backslash frac\{x\}\{a-b\}=\backslash frac\{a\}\{x-b\}$ then x = ……

The discriminant of the equation $x^2+4x+2=0x^2+4x+2=0$ is ……

The discriminant of the equation $p{x}^2+qx+r=0px^2+\; qx\; +\; r\; =\; 0$ is ……

The degree of a quadratic equation is

In a quadratic equation $a{x}^2+bx+c=0ax^2+bx+c=0$, if $b^2-4acb^2-4ac$ >0 , then the roots are ……

A quadratic equation, whose roots are $2+\sqrt{3}2+\backslash sqrt\{3\}$ and $2-\sqrt{3}2-\backslash sqrt\{3\}$ = ……

The adjacent diagram indicates ……

If $\sqrt{x}+\frac{58}{\sqrt{x}}=31\backslash sqrt\{x\}+\backslash frac\{58\}\{\backslash sqrt\{x\}\}=\; 31$, then x =

If 1 is a common root of $a{x}^2+ax+2=0ax^2+ax+2=0$ and $x^2+x+b=0x^\; 2+x+b=0$, then a. b = ……